Title (en)

APPARATUS FOR DETECTING MACHINING CONDITIONS IN A MACHINE TOOL

Publication

EP 0431818 A3 19920610 (EN)

Application

EP 90312908 A 19901128

Priority

JP 31782589 A 19891208

Abstract (en)

[origin: EP0431818A2] An apparatus for detecting machining conditions in a machine tool characterised by electro-magnetic bearing means (10) for magnetically supporting at least one spindle (9,15) of the machine tool; a detector (20) for detecting a variable which depends upon the electro-magnetic state of the bearing means (10) and for producing detection signals in relation thereto; a plurality of different frequency band pass filters (32-35) coupled to the detector (20) so as to receive the detection signals from the latter; and comparator means (36a-36d) for comparing output signals of said different frequency band pass filters (32-35) with respective set values. <IMAGE>

IPC 1-7

G05B 19/405

IPC 8 full level

B23Q 17/09 (2006.01); G05B 19/416 (2006.01)

CPC (source: EP US)

F16C 32/044 (2013.01 - EP US); G05B 19/4163 (2013.01 - EP US); G05B 2219/37285 (2013.01 - EP US); G05B 2219/37339 (2013.01 - EP US); G05B 2219/37341 (2013.01 - EP US); G05B 2219/37344 (2013.01 - EP US); G05B 2219/37493 (2013.01 - EP US); G05B 2219/37525 (2013.01 - EP US); G05B 2219/49271 (2013.01 - EP US)

Citation (search report)

• [X] EP 0315469 A2 19890510 - SEIKO SEIKI KK [JP]
• [Y] US 4853680 A 19890801 - THOMAS CHARLES E [US]
• [Y] US 4642617 A 19870210 - THOMAS CHARLES E [US], et al
• [A] US 4031368 A 19770621 - COLDING BERTIL, et al

Designated contracting state (EPC)

DE FR

DOCDB simple family (publication)

EP 0431818 A2 19910612; EP 0431818 A3 19920610; EP 0431818 B1 19960724; DE 69027913 D1 19960829; DE 69027913 T2 19961212; JP 2555296 B2 19961120; JP H03245948 A 19911101; US 5187434 A 19930216

DOCDB simple family (application)

EP 90312908 A 19901128; DE 69027913 T 19901128; JP 31782589 A 19891208; US 61757090 A 19901126